I have found this dictionary to be a great help. If you are at all interested in studying and understanding the historical development of Christian theology a Greek and Latin reference is a must. This dictionary is clearly presented and thoroughly covers the major Christian doctrines.

Muller provides a wealth of theological wisdom in this slim volume. For all us poor, ignorant wretches who never learned Latin or Greek, his work is a welcome guide. Muller defines key terms clearly and succinctly. This dictionary has enhanced my reading of various older books, including Philip Scaff's three-volume set, The Creeds of Christendom, which uses Latin theological terms liberally. I could have muddled through Schaff without Muller's dictionary, but with it, the history has been far richer.